A relationship that someone only goes into because they are desperate and can't find anyone else to go out with them.
Girl 1: Honey, what made you go out with him in the first place?
Girl 2: I was lonely and he was the first guy to ask me out in a long time. It seemed like a good idea at the time...
Girl 1: Did you even like him?
Girl 2: No, not really.
Girl 1: So it was a desperationship, then. You only went out with him because you wanted to be with someone.
Girl 2: Basically.
When two desperate people are stuck in a relationship held together by only the sad nature of their lives and the fear of never finding anyone else.
"Hey, who's bright idea was it to set Chad up with Amy? Talk about a desperationship gone wrong."
Mason's desperationship with Marla was sadder than a Mid 90's mix cd.